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SQL Standard (4.23.3.4 Table check constraints, part 2, SQL:2016) says that CHECK constraint rejects rows *only* if the condition is FALSE. That is, both TRUE and NULL should be allowed.
105 lines
3.1 KiB
Text
105 lines
3.1 KiB
Text
#
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# Check of check constraints
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set @save_check_constraint=@@check_constraint_checks;
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create table t1 (a int check(a>10), b int check (b > 20), constraint `min` check (a+b > 100), constraint `max` check (a+b <500)) engine=myisam;
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show create table t1;
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insert into t1 values (100,100);
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--error ER_CONSTRAINT_FAILED
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insert into t1 values (1,1);
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--error ER_CONSTRAINT_FAILED
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insert into t1 values (20,1);
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--error ER_CONSTRAINT_FAILED
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insert into t1 values (20,30);
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--error ER_CONSTRAINT_FAILED
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insert into t1 values (500,500);
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--error ER_CONSTRAINT_FAILED
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insert into t1 values (101,101),(102,102),(600,600),(103,103);
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select * from t1;
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truncate table t1;
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insert ignore into t1 values (101,101),(102,102),(600,600),(103,103);
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select * from t1;
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set check_constraint_checks=0;
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truncate table t1;
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insert into t1 values (101,101),(102,102),(600,600),(103,103);
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select * from t1;
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set check_constraint_checks=@save_check_constraint;
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--replace_regex /failed for.*/failed for table/
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--error ER_CONSTRAINT_FAILED
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alter table t1 add c int default 0 check (c < 10);
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set check_constraint_checks=0;
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alter table t1 add c int default 0 check (c < 10);
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alter table t1 add check (a+b+c < 500);
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set check_constraint_checks=@save_check_constraint;
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show create table t1;
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--error ER_CONSTRAINT_FAILED
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insert into t1 values(105,105,105);
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--error ER_CONSTRAINT_FAILED
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insert into t1 values(249,249,9);
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insert into t1 values(105,105,9);
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select * from t1;
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create table t2 like t1;
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show create table t2;
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--error ER_CANT_DROP_FIELD_OR_KEY
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alter table t2 drop constraint c;
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alter table t2 drop constraint if exists c;
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alter table t2 drop constraint min;
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show create table t2;
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drop table t1,t2;
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#
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# check constraint name auto-generation:
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#
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create or replace table t1 (a int, b int, constraint check (a>b));
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show create table t1;
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create or replace table t1 (a int, b int,
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constraint CONSTRAINT_1 check (a>1),
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constraint check (b>1));
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show create table t1;
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create or replace table t1 (a int, b int,
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constraint CONSTRAINT_1 check (a>1),
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constraint check (b>1),
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constraint CONSTRAINT_2 check (a>b));
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show create table t1;
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drop table t1;
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#
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# MDEV-10370 Check constraints on virtual columns fails on INSERT when column not specified
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#
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create table t1(c1 int, c2 int as (c1 + 1), check (c2 > 2));
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--error ER_CONSTRAINT_FAILED
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insert into t1(c1) values(1);
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insert into t1(c1) values(2);
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drop table t1;
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#
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# MDEV-11117 CHECK constraint fails on intermediate step of ALTER
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#
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-- error ER_GENERATED_COLUMN_FUNCTION_IS_NOT_ALLOWED
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create or replace table t1( c1 int auto_increment primary key, check( c1 > 0 or c1 is null ) );
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#
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# MDEV-12421 Check constraint with query crashes server and renders DB unusable
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#
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--error ER_GENERATED_COLUMN_FUNCTION_IS_NOT_ALLOWED
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create table t1 (a int check (@b in (select user from mysql.user)));
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--error ER_GENERATED_COLUMN_FUNCTION_IS_NOT_ALLOWED
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create table t1 (a int check (a > @b));
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#
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# MDEV-13596 CHECK constraints disallow NULL to pass through, violating SQL
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#
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create table t1 (a int check (a = 1));
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insert t1 values (1);
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--error ER_CONSTRAINT_FAILED
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insert t1 values (2);
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insert t1 values (NULL);
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select * from t1;
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drop table t1;
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